body{
    margin: 0;
    background-color: #667185;
}
#all{
    margin: 0 auto;
    width: 1000px;
    height: 800px;
    background-image: url("../images/shu.jpg");
}
#all .top{
    margin: 0;
    width: 1000px;
    height: 60px;
}
#all .top .left{
    margin: 0;
    float: left;
}
#all .top .right{
    margin: 0;
    float: right;
}
#all .middle{
    float: left;
    margin: 0;
    width: 1000px;
    height: 740px;
}
#all .middle a{
    font-size: 40px;
    line-height: 30px;
    text-decoration: none;

}
#all .middle .left{
    float: left;
    margin: 0;
    width: 500px;
    height: 740px;
}
#all .middle .right{
    float: left;
    margin: 0;
    width: 500px;
    height: 740px;
}
#center{
    margin: 100px 80px;
    width: 300px;
    height: 80px;
    text-align: center;
}